{"id":"CVE-2026-106434","title":"The explicit decryption component of MongoDB libmongocrypt can return an unrecognized encrypted payload unchanged instead of returning a decryption error","summary":"The explicit decryption component of MongoDB libmongocrypt can return an unrecognized encrypted payload unchanged instead of returning a decryption error. An actor who can modify stored encrypted fields, such as a database writer, server…","severity":"medium","cvss":4.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","cwe":["CWE-354"],"published":"2026-10-08","updated":"2026-10-08","sourceUpdated":"2026-10-08T20:49:23.240","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-106434","references":[{"url":"https://jira.mongodb.org/browse/MONGOCRYPT-966","label":"cna@mongodb.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106434.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-106434"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-106434"}],"tags":["nvd","csaf","vex","red-hat","cve.org"],"ingestedAt":"2026-10-08T20:06:22.183Z","vendor":"Red Hat","epss":0.00112,"epssPercentile":0.01371,"product":"libmongocrypt","affected":["libmongocrypt >= 1.5.0 < 1.20.5"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-08T19:30:38.647440Z"},"slug":"CVE-2026-106434","body":"## Overview\n\nThe explicit decryption component of MongoDB libmongocrypt can return an unrecognized encrypted payload unchanged instead of returning a decryption error. An actor who can modify stored encrypted fields, such as a database writer, server, or network intermediary, can cause an affected application to process the supplied bytes as decrypted plaintext.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · updated 2026-10-09 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106434.json)","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":23.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}